These volumes record detailed breakdowns of the costs involved in the completion of orders. For each order the stock number, a description of the order and who it is for is recorded, and overall figures of costs, sale, profit or loss and the percentage of this are given. Then follows a more detailed breakdown for the costs per engine. There are summary sheets for each half year ending.
- Access is given in accordance with the Science and Industry Museum's access policy. Material from this collection is available to researchers through the Museum's Archive Study Area.